Missing sideboard cards? The full 15-card sideboard runs about $43.41.
Buy sideboard on ManapoolEldrazi is a slower, grindy deck that mostly plays big colorless threats and ramp, so our interactive counterspells aimed at small creatures are weak; Stern Scolding whiffs on most of their relevant threats. Engineered Explosives comes in to sweep their Eldrazi Spawn tokens and cheap permanents, and Tormod's Crypt can slow down Kozilek's Command graveyard exile synergy and strip fuel if needed. The matchup is really a race: keep the Belcher plan intact and use Jwari Disruption/Counterspell to protect our combo turn rather than trading with their ground creatures.
Rakdos Delirium relies heavily on its graveyard for Nethergoyf, escape, and delirium enablers, making Tormod's Crypt a strong proactive disruption piece against their core gameplan. The extra Spell Snare copies are still reasonable here, though narrower than they first look: only Fear of Missing Out and Orcish Bowmasters are mana value 2, so they give us cheap counters for those two creatures. Thoughtseize, Stitcher's Supplier, Nethergoyf, Moonshadow, and Lightning Bolt are all mana value 1 and are not hit by Spell Snare. Beyeen Veil's -2/-0 is weak here since it only shrinks power and doesn't stop their creatures (Nethergoyf, Moonshadow, Detective's Phoenix) from doing their jobs, so it comes out. Keep our full countermagic suite to protect the combo from their discard and removal.
Esper Control's only mainboard creature is Solitude, so Stern Scolding has few targets. It can hit Solitude (toughness 2, even when it is evoked), but with only four of them we trim both copies. Consign to Memory is a reasonable fit: it counters colorless spells like Isochron Scepter and triggered abilities like Solitude's exile trigger. It cannot counter Teferi's -3 (a loyalty ability, not a triggered ability), Narset's static ability, or their colored spells such as Sink into Stupor. Spell Snare has only narrow live targets (Consult the Star Charts, Isochron Scepter), since Narset and Teferi are mana value 3 and Silence is mana value 1, so we trim two copies for answers that line up better with their plan.